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Heavy duty products that place plates on either side the door tied together with screws or bolts can be used to prevent delamination. Door chains — allows the doors to be opened slightly to view outside while still remaining locked. Secondary, internal locks — sliding bolts, hooks and speciality latches, metal blocks or bars mounted internally.
Heavy-duty models are one-inch in diameter and are usually made of steel, most often galvanized, but sometimes painted or electropolished for cosmetic reasons. In lighter duty applications, such as smaller utility trailers, a ¾-inch diameter lockrod can be used; these can be made of steel or aluminum.
Door chain. A door chain, security chain, or security door chain or chain door interviewer [1] consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door. [2] They are commonly used on hotel and motel ...
Heart locks had two prominent characteristics: one was a spring-loaded cover that pivoted over the keyhole to keep dirt and insects out of the lock that was called a "drop". The other was a point formed at the bottom of the lock so a chain could be attached to the lock body to prevent the lock from getting lost or stolen.
3M Dual Lock RFID transponder attached to car with hook-and-loop fastener The Slidingly Engaging Fastener was developed to address several problems with common hook-and-loop fasteners. [ 15 ] [ 16 ] Heavy-duty variants (such as "Dual Lock" or "Duotec") feature mushroom-shaped stems on each face of the fastener, providing an audible snap when ...
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